CN110408832B - Nitrogen-rich manganese vanadium-based material and preparation method thereof - Google Patents
Nitrogen-rich manganese vanadium-based material and preparation method thereof Download PDFInfo
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- CN110408832B CN110408832B CN201910814628.8A CN201910814628A CN110408832B CN 110408832 B CN110408832 B CN 110408832B CN 201910814628 A CN201910814628 A CN 201910814628A CN 110408832 B CN110408832 B CN 110408832B
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- C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
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Abstract
The invention relates to the technical field of materials, in particular to a nitrogen-rich manganese vanadium-based material and a preparation method thereof, wherein the nitrogen-rich manganese vanadium-based material comprises the following chemical components in percentage by mass: the preparation method comprises the following steps of: a. crushing the manganese-vanadium base material, and then grinding into fine powder with a certain granularity; b. pressing the fine powder obtained in the step a into balls; c. feeding the spherical manganese-vanadium base material into a heating nitriding furnace; d. the spherical manganese-vanadium base material is nitrided in a heating nitriding furnace. The preparation method of the nitrogen-rich manganese-vanadium-based material has high nitridation efficiency, the yield of the manganese-vanadium-based base material N is high, the N can improve the tensile strength and the yield strength of the material, the strength of the manganese-vanadium-based base material is obviously improved, the N is a cheap alloying element, the preparation cost is low, and the nitrogen-rich manganese-vanadium-based material has good technical and economic indexes and comprehensive economic benefits.
Description
Technical Field
The invention relates to the technical field of materials, in particular to a nitrogen-rich manganese vanadium-based material and a preparation method thereof.
Background
In the smelting production process of the steel bar, the vanadium micro-alloy steel and the gear steel, nitrogen is blown into molten steel to improve the content of nitrogen in the produced finished steel, so that the strength of the finished steel is improved. The finished steel contains 0.01 percent (mass percent) of nitrogen, which is equivalent to 0.01 percent (mass percent) of vanadium, and the influence on the tensile strength and the yield strength is avoided, and the cost price of the nitrogen is far lower than that of the vanadium, so that the nitrogen increase in the molten steel can obtain very remarkable technical indexes and comprehensive economic benefits. The current research shows that the nitrogen increasing effect of the finished steel obtained by adding nitrogen element into the auxiliary adding raw material and then adding into the molten steel during production is better than that of the finished steel obtained by blowing nitrogen into the molten steel.
The manganese-vanadium-based material is used as an alloy and is composed of Mn, C, V, Fe and the like, and is used as an auxiliary addition raw material to be added into molten steel during molten steel smelting production of steel bar, vanadium micro-alloy steel and gear steel in a molten steel LF refining furnace, and the manganese-vanadium-based material mainly plays a role in refining crystal grains in finished steel and enhancing the strength of the finished steel. In the molten steel smelting process, the strength requirement on the manganese-vanadium-based material is high, and some existing manganese-vanadium-based materials cannot meet the strength requirement and cannot be used, so that the use of the manganese-vanadium-based materials is influenced.
In summary, in the smelting production process of steel bar, vanadium micro-alloy steel and gear steel, a nitrogen-rich manganese-vanadium-based material with high strength is urgently needed.
Disclosure of Invention
The invention aims to provide a nitrogen-rich manganese vanadium-based material with high strength.
The technical scheme adopted by the invention for solving the technical problems is as follows: a nitrogen-rich manganese vanadium-based material comprises the following chemical components in percentage by mass: 40-60% of Mn, 10-20% of C, 4-8% of V, 15-25% of N and the balance of Fe.
In addition, the invention also aims to solve the technical problem of providing a preparation method of the nitrogen-rich manganese vanadium-based material with high strength.
The preparation method of the nitrogen-rich manganese vanadium-based material comprises the following steps:
a. crushing the manganese-vanadium base material, and then grinding into fine powder with a certain granularity;
b. pressing the fine powder obtained in the step a into balls;
c. feeding the spherical manganese-vanadium base material into a heating nitriding furnace;
d. the spherical manganese vanadium base material is nitrided in a heating nitriding furnace, the spherical manganese vanadium base material is firstly heated to 950-.
Further, in the step a, the chemical components of the manganese vanadium base material are as follows by mass percent: 55-65% of Mn, 15-25% of C, 5-10% of V and the balance of Fe.
Further, in the step a, the size fraction of the fine powder is less than or equal to 200 meshes, and the size fraction less than 250 meshes is not less than 80% of the total.
And further, in the step b, adding an adhesive and water in the process of pressing the fine powder into the spherical manganese-vanadium base material, and airing after balling to ensure that the water content in the spherical manganese-vanadium base material is less than or equal to 0.5 percent.
Further, the adhesive is bentonite.
Further, in the step b, the cross-section diameter of the base material of the manganese vanadium pressed into the ball shape is between 10 and 15 mm.
Further, the heating nitriding furnace includes the furnace body, the base, charge the crucible, a housing, heating resistor all sets up in the furnace body, the setting can be dismantled on the base to the casing, the space that casing and base formed is the reacting chamber, charge the crucible and be located the reacting chamber, heating resistor is located around the casing, the bottom of furnace body is provided with nitrogen gas and advances the pipe, the exit end that nitrogen gas advances the pipe is located the reacting chamber, the top of furnace body is provided with the nitrogen gas exit tube.
Furthermore, the heating nitriding furnace also comprises a thermocouple, and the thermocouple is arranged in the furnace body.
The invention has the beneficial effects that: the nitrogen-rich manganese-vanadium-based material contains 15-25% of N, the N can improve the tensile strength and yield strength of the material, the strength of the manganese-vanadium-based base material is obviously improved, the N can promote the separation of V in the material, the precipitation strengthening effect of V is enhanced, the strength of the manganese-vanadium-based base material is further enhanced, the N is a cheap alloying element, the preparation cost is low, and the nitrogen-rich manganese-vanadium-based material has better technical and economic indexes and comprehensive economic benefits. Meanwhile, the preparation method of the nitrogen-rich manganese-vanadium-based material comprises the steps of crushing a manganese-vanadium base material, grinding the crushed manganese-vanadium base material into fine powder with a certain granularity, pressing the fine powder into spheres, and finally sending the spherical manganese-vanadium base material into a heating nitriding furnace for nitriding, wherein the spherical manganese-vanadium base material is heated to 950-; the preparation method of the nitrogen-rich manganese-vanadium-based material has high nitridation efficiency, the yield of the manganese-vanadium-based base material N is high, and the obtained nitrogen-rich manganese-vanadium-based material has stable performance and is beneficial to popularization.
Drawings
FIG. 1 is a schematic view of a heating nitriding furnace;
the labels in the figure are: furnace body 1, charging crucible 2, casing 3, heating resistor 4, nitrogen advance pipe 5, nitrogen exit tube 6, thermocouple 7, base 8.
Detailed Description
The invention will be further explained with reference to the drawings.
The invention relates to a nitrogen-rich manganese vanadium-based material which comprises the following chemical components in percentage by mass: 40-60% of Mn, 10-20% of C, 4-8% of V, 15-25% of N, and the balance Fe, the melting point: 1200 ℃ and 1250 ℃.
N can improve the tensile strength and the yield strength of the material, the strength of the manganese-vanadium-based base material is obviously improved, the N can promote the separation of V in the material, the precipitation strengthening effect of V is enhanced, and the strength of the manganese-vanadium-based base material is further enhanced.
The preparation method of the nitrogen-rich manganese vanadium-based material comprises the following steps:
a. crushing the manganese-vanadium base material, and then grinding into fine powder with a certain granularity;
b. pressing the fine powder obtained in the step a into balls;
c. feeding the spherical manganese-vanadium base material into a heating nitriding furnace;
d. the spherical manganese vanadium base material is nitrided in a heating nitriding furnace, the spherical manganese vanadium base material is firstly heated to 950-.
In the step a, the chemical components of the manganese vanadium base material are as follows in percentage by mass: 55-65% of Mn, 15-25% of C, 5-10% of V and the balance of Fe. After the manganese-vanadium base material is crushed, grinding the crushed manganese-vanadium base material into fine powder with a certain granularity, wherein the granularity of the fine powder is preferably less than or equal to 200 meshes, and the granularity less than 250 meshes is not less than 80% of the total number.
The spherical manganese vanadium base material can be conveniently sent into a heating nitriding furnace for nitriding, nitrogen can flow in the heating nitriding furnace, nitriding of the manganese vanadium base material is facilitated, N can enter the manganese vanadium base material conveniently, and the section diameter of the spherical manganese vanadium base material is preferably 10-15 mm. A large number of tests and practices prove that the manganese-vanadium base material is crushed, ground into fine powder with a certain particle size, and pressed into balls, so that the nitriding effect and the nitriding efficiency of the manganese-vanadium base material can be improved. In order to facilitate the fine powder to be pressed into the spherical manganese-vanadium base material, in the step b, the adhesive and the water are added in the process of pressing the fine powder into the spherical manganese-vanadium base material, the spherical manganese-vanadium base material is aired after balling, so that the water content in the spherical manganese-vanadium base material is less than or equal to 0.5 percent, the adhesive can adopt bentonite, the amount of the added adhesive is 2-5 percent of the total weight, the amount of the added water is 2-4 percent of the total weight during pressing, and the pressing pressure is not more than 30 KN.
The spherical manganese vanadium base material is nitrided in a heating nitriding furnace, and one preferable structure of the heating nitriding furnace is as follows: as shown in fig. 1, the heating nitriding furnace includes furnace body 1, base 8, charge crucible 2, casing 3, heating resistor 4 all sets up in furnace body 1, casing 3 can dismantle the setting on base 8, the space that casing 3 and base 8 formed is the reacting chamber, charge crucible 2 is located the reacting chamber, heating resistor 4 is located around casing 3, the bottom of furnace body 1 is provided with nitrogen gas and advances pipe 5, the exit end that nitrogen gas advances pipe 5 is located the reacting chamber, the top of furnace body 1 is provided with nitrogen gas exit tube 6. When the heating nitriding furnace is used for nitriding the spherical manganese-vanadium base material, firstly, the spherical manganese-vanadium base material is sent into a reaction chamber, nitrogen with positive pressure enters the reaction chamber from a nitrogen inlet pipe 5, so that the reaction chamber is filled with the nitrogen, then a heating resistor 4 works, the spherical manganese-vanadium base material is heated to 950 plus materials at 960 ℃, the heating rate is less than or equal to 10 ℃/min, heat is preserved for 300 plus materials for 310min, and then the temperature is reduced to room temperature, so that the nitriding process is completed, and the residual nitrogen is discharged from a nitrogen outlet pipe 6. Through detection, the heating nitriding furnace has high nitriding efficiency, and the nitrogen yield can be stably controlled between 60 and 80 percent. In order to facilitate accurate temperature control, the thermal nitriding furnace is also provided with a thermocouple 7, the thermocouple 7 is arranged in the furnace body 1, and the thermocouple 7 is used for measuring the temperature of the manganese vanadium base material and ensuring the nitriding effect of the manganese vanadium base material.
In conclusion, the preparation method of the nitrogen-rich manganese vanadium-based material has high nitridation efficiency, the yield of the manganese vanadium-based base material N is high, and the obtained nitrogen-rich manganese vanadium-based material has stable performance and is beneficial to popularization.
Example 1
The preparation method of the nitrogen-rich manganese vanadium-based material comprises the following steps:
a. after the manganese vanadium base material is crushed, grinding the crushed manganese vanadium base material into fine powder with the grain size not more than 200 meshes and the grain size less than 250 meshes being not less than 80% of the total number, wherein the manganese vanadium base material comprises the following chemical components in percentage by mass: 60% of Mn, 20% of C, 8% of V and the balance of Fe;
b. pressing the fine powder obtained in the step a into spheres, adding bentonite and water during pressing, airing after the spheres are formed, so that the water content in the spherical manganese vanadium base material is less than or equal to 0.5%, and the section diameter of the spherical manganese vanadium base material is 12 mm;
c. feeding the spherical manganese-vanadium base material into a heating nitriding furnace;
d. the spherical manganese vanadium base material is nitrided in a heating nitriding furnace, the spherical manganese vanadium base material is heated to 950 ℃, then is kept for 300min, and is finally cooled to room temperature, the whole nitriding process is under the nitrogen atmosphere, the pressure of the entering nitrogen is 0.15MPa, and the flow is 3 ml/s.
Detecting the obtained nitrogen-rich manganese vanadium-based material, wherein the chemical components in percentage by mass are as follows: 51% of Mn, 17% of C, 6.8% of V, 15% of N and the balance of Fe.
Example 2
The preparation method of the nitrogen-rich manganese vanadium-based material comprises the following steps:
a. after the manganese vanadium base material is crushed, grinding the crushed manganese vanadium base material into fine powder with the grain size not more than 200 meshes and the grain size less than 250 meshes being not less than 80% of the total number, wherein the manganese vanadium base material comprises the following chemical components in percentage by mass: 63% of Mn, 18% of C, 7% of V and the balance of Fe;
b. pressing the fine powder obtained in the step a into spheres, adding bentonite and water during pressing, and airing after the spheres are formed, so that the water content in the spherical manganese vanadium base material is less than or equal to 0.5 percent, and the section diameter of the spherical manganese vanadium base material is 15 mm;
c. feeding the spherical manganese-vanadium base material into a heating nitriding furnace;
d. the spherical manganese vanadium base material is nitrided in a heating nitriding furnace, the spherical manganese vanadium base material is heated to 960 ℃, then is subjected to heat preservation for 310min, and finally is cooled to room temperature, the whole nitriding process is in a nitrogen atmosphere, the pressure of entering nitrogen is 0.18MPa, and the flow is 4 ml/s.
Detecting the obtained nitrogen-rich manganese vanadium-based material, wherein the chemical components in percentage by mass are as follows: 54.18% of Mn, 15.48% of C, 6.02% of V, 20% of N and the balance of Fe.
Example 3
The preparation method of the nitrogen-rich manganese vanadium-based material comprises the following steps:
a. after the manganese vanadium base material is crushed, grinding the crushed manganese vanadium base material into fine powder with the grain size not more than 200 meshes and the grain size less than 250 meshes being not less than 80% of the total number, wherein the manganese vanadium base material comprises the following chemical components in percentage by mass: 58% of Mn, 19% of C, 9% of V and the balance of Fe;
b. pressing the fine powder obtained in the step a into spheres, adding bentonite and water during pressing, and airing after the spheres are formed, so that the water content in the spherical manganese vanadium base material is less than or equal to 0.5%, and the section diameter of the spherical manganese vanadium base material is 13 mm;
c. feeding the spherical manganese-vanadium base material into a heating nitriding furnace;
d. the spherical manganese vanadium base material is nitrided in a heating nitriding furnace, the spherical manganese vanadium base material is heated to 954 ℃ firstly, then is kept for 305min, and finally is cooled to room temperature, the whole nitriding process is in a nitrogen atmosphere, the pressure of entering nitrogen is 0.2MPa, and the flow is 4 ml/s.
Detecting the obtained nitrogen-rich manganese vanadium-based material, wherein the chemical components in percentage by mass are as follows: 50.46% of Mn, 16.53% of C, 7.83% of V, 17% of N and the balance of Fe.
Claims (7)
1. A preparation method of a nitrogen-rich manganese vanadium-based material is characterized by comprising the following steps: the nitrogen-rich manganese vanadium-based material comprises the following chemical components in percentage by mass: 40-60% of Mn, 10-20% of C, 4-8% of V, 15-25% of N and the balance of Fe, comprising the following steps:
a. crushing the manganese-vanadium base material, and then grinding the crushed manganese-vanadium base material into fine powder with a certain granularity, wherein the manganese-vanadium base material comprises the following chemical components in percentage by mass: 55-65% of Mn, 15-25% of C, 5-10% of V and the balance of Fe;
b. pressing the fine powder obtained in the step a into balls;
c. feeding the spherical manganese-vanadium base material into a heating nitriding furnace;
d. the spherical manganese vanadium base material is nitrided in a heating nitriding furnace, the spherical manganese vanadium base material is firstly heated to 950-.
2. The method of preparing a nitrogen-rich manganese vanadium-based material of claim 1, wherein: in the step a, the size fraction of the fine powder is less than or equal to 200 meshes, and the size fraction less than 250 meshes is not less than 80% of the total number.
3. The method of preparing a nitrogen-rich manganese vanadium-based material of claim 1, wherein: in the step b, adding the adhesive and the water in the process of pressing the fine powder into the spherical manganese-vanadium base material, and airing after balling to ensure that the water in the spherical manganese-vanadium base material is less than or equal to 0.5 percent.
4. A method of producing nitrogen-rich manganese vanadium-based materials as claimed in claim 3, wherein: the adhesive is bentonite.
5. The method of preparing a nitrogen-rich manganese vanadium-based material of claim 1, wherein: in the step b, the section diameter of the spherical manganese vanadium base material is between 10 and 15 mm.
6. The method of producing nitrogen-rich manganese vanadium-based materials according to any one of claims 1 to 5, wherein: heating nitriding furnace includes furnace body (1), base (8), charge crucible (2), casing (3), heating resistor (4) all set up in furnace body (1), casing (3) can be dismantled and set up on base (8), casing (3) are the reacting chamber with the space that base (8) formed, charge crucible (2) are located the reacting chamber, heating resistor (4) are located around casing (3), the bottom of furnace body (1) is provided with nitrogen gas and advances pipe (5), the exit end that nitrogen gas advances pipe (5) is located the reacting chamber, the top of furnace body (1) is provided with nitrogen gas exit tube (6).
7. The method of preparing a nitrogen-rich manganese vanadium-based material of claim 6, wherein: the heating nitriding furnace also comprises a thermocouple (7), and the thermocouple (7) is arranged in the furnace body (1).
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| CN101782320A (en) * | 2010-01-08 | 2010-07-21 | 河南省西保冶材集团有限公司 | Vanadium-nitrogen alloy vacuum furnace |
| CN104894455A (en) * | 2015-05-18 | 2015-09-09 | 河北钢铁股份有限公司承德分公司 | Manganese vanadium iron nitride and production method thereof |
| CN104961108A (en) * | 2015-06-09 | 2015-10-07 | 四川大学 | Push dynamic continuous preparation method for (M1, M2) (CxN1-x) powder and push dynamic continuous sintering device |
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| CN103572086B (en) * | 2013-11-18 | 2016-02-17 | 福建新航凯材料科技有限公司 | The production method of manganese-vanadium nitride multicomponent alloy |
| CN108396161A (en) * | 2018-02-28 | 2018-08-14 | 河钢股份有限公司承德分公司 | A method of preparing nitrogenized manganese vanadium iron |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101782320A (en) * | 2010-01-08 | 2010-07-21 | 河南省西保冶材集团有限公司 | Vanadium-nitrogen alloy vacuum furnace |
| CN104894455A (en) * | 2015-05-18 | 2015-09-09 | 河北钢铁股份有限公司承德分公司 | Manganese vanadium iron nitride and production method thereof |
| CN104961108A (en) * | 2015-06-09 | 2015-10-07 | 四川大学 | Push dynamic continuous preparation method for (M1, M2) (CxN1-x) powder and push dynamic continuous sintering device |
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